Tanalised Wood Explained

What is tanalised timber?

Tanalised timber also known as pressure treated timber, is wood that has endured a pressurised chemical treatment to preserve the wood. The process makes the wood more defiant to rot, fungus, mould, insect attack and damp weather conditions.

Five Steps to Tanalise Wood:

  1. Wood is loaded into a large treatment tank and put under a vacuum.
  2. The tank is completely flooded with wood preservative.
  3. Whilst full, the tank is put under hydraulic pressure forcing preservative deep into the wood.
  4. The tank is drained which breaks the vacuum, this allows the low pressure inside the wood to absorb any remaining preservative.
  5. The wood is left to dry naturally.

The intense treatment process the wood undergoes ensures the timber is more durable and long lasting. 

How to Tell if Wood Has Been Tanalised

Tanalised wood should be clearly marked as treated with a stamp, although this is often removed when the wood is cut down to size. Relatively fresh treated wood will have a green tinge to it but not to worry, this by-product of the tanalising process fades over time.